Opel straight-6 engine

Opel Straight-6
Overview
Manufacturer	Opel
Also called	Vauxhall Straight-6
Production	1930-1966
Layout
Configuration	Naturally aspirated Straight-6
Displacement	1.8 L (1,790 cc) 2.6 L (2,605 cc)
Cylinder bore	65 mm (2.56 in) 85 mm (3.35 in)
Piston stroke	90 mm (3.54 in) 76.5 mm (3.01 in)
Valvetrain	OHV 2 valves x cyl.
Compression ratio	7.8:1
Combustion
Fuel system	Carburetor
Fuel type	Petrol
Cooling system	Water-cooled
Output
Power output	33.5–91 PS (33.0–89.8 hp; 24.6–66.9 kW)
Torque output	100–186 N⋅m (74–137 lb⋅ft)
Chronology
Successor	Opel CIH engine

Opel used the straight-6 engine configuration for many years. Opel used two straight-6 engines prior to the better-known CIH engine family.

Moonlight

The Opel Moonlight roadster was the first Opel vehicle with a straight-6. It used a 1.8 L (1,790 cc) six in 1933. It was a 12-valve engine with a very-undersquare 65 mm × 90 mm (2.56 in × 3.54 in) bore and stroke, typical for the time. This engine produced 33.5 PS (33.0 hp; 24.6 kW) and 100 N⋅m (74 lb⋅ft).

Kapitän

The 1959 Opel Kapitän was the next vehicle from the company with a straight-6 engine. This was a 2.6 L (2,605 cc) unit with 12 overhead valves. Bore and stroke were now oversquare for high power output at 85 mm × 76.5 mm (3.35 in × 3.01 in). A single Opel-designed carburetor and 7.8:1 compression yielded 91 PS (90 hp; 67 kW) and 186 N⋅m (137 lb⋅ft).

See also

• List of GM engines